build failed with g++ v. 4.4.5

err msg: frameworks/base/media/libstagefright/MediaExtractor.cpp:62: error: invalid conversion from ‘const char*’ to ‘char*’
strrchr provides two prototypes. the one used returns const char* instead of char*

Change-Id: I6442ee642aebfbfc2f977bab40016cfedc7789ac